The games, which included titles like “FishVille” and “Mafia Wars 2,” weren’t of the scale of games like “FarmVille 2″ which boast millions of players checking the game every day. Zynga’s first “FarmVille era” has more or less come to a close, with the stock falling well off its $10 IPO price to roughly $2.40 today.

Games on the scale of “FarmVille 2″ are still rare for Zynga, and even then, they don’t compare to its initial success on Facebook with games like the original FarmVille and CityVille. The original “FarmVille,” at its peak, had more than ten million players logging in every day, according to AppData. “CityVille” broke the 10-million daily player mark, and “CastleVille” had 8.4 million daily players at its height, according to AppData.

As players are being reminded today, these online games only exist on Zynga’s infrastructure — and the price of playing such a game is that they can disappear. Instead of classic games on consoles, or even some native apps, the data is no longer accessible when Zynga pulls the plug. In the case of “PetVille,” that led to a few sad goodbyes based on the comment thread.

The list of games being shut down is mostly games that are run on Facebook — which isn’t surprising given that Zynga, like many other companies, is seeing its player base migrate increasingly to mobile devices. Much of its success currently lies with its mobile games, like “Texas Hold ‘Em Poker” and “Words With Friends.”

Looking at the numbers of players below, it is clear why Zynga would shut the games down — they aren’t on the scale of Zynga’s most popular games. Shutting them down allows Zynga to re-allocate resources and reduce costs.